An interior rearview mirror assembly suitable for use in a vehicle includes a variable reflectance reflective element, which includes an electrochromic medium, a first information display positioned to the rear of the variable reflectance reflective element, and a second information display. The mirror assembly further includes a single control for adjusting the luminous intensity of the first information display and the second information display and at least one light sensor, with the output of the control being generated responsive to a light level sensed by the at least one light sensor. In addition, the luminous intensity of the first information display and of the second information display increases responsive to the output of the control to compensate for any decrease in transmission of the electrochromic medium.